RCN-robustness.
[1]} analyze the relaxed convex potential function \(\phi ^\star \)  through the lens of a new notion which
we will
call RCN-robustness.
Their definition (Definition 1 of [1]}) applies to a general pair \((\ell ,{\cal F})\)  where \(\ell \)  is a loss function and \({\cal F}\)  is a class which may consist of any collection of functions mapping a domain \(X\)  to \(\) .
